Hi,
We have been requested to put a techno/commercial proposal in front of one of our major customers in India by 14/11/14 for Lead acid battery chargers for Industrial engines.
Generally the charger is for 12V or 24V lead acid cells used as cranking batteries for stationary industrial engines configured as Diesel Generators. Given below are the basic specifications and I was wondering if you guys can point us in the right direction (the best and cost effective solution).
The basic spec requires permanent connection to the mains with an input voltage range of 160V to 270V AC RMS 50/60Hz. The nominal output is 5A with (10A boost) and provides for 3 or 4 stage charging, bulk constant current charge, absorption charge, equalization, float charge.
The charger must withstand direct online cranking conditions and permanent connection to the battery including load dumps to ISO 7637-2 test severity level 4.. The operating temperature must be
-10C to +70C as the genset may be located in very extreme outdoor temperature conditions but protected from rain.
The charger must be protected for under voltage below 140VAC and over voltage above 300VAC and must not draw current from the battery under any circumstances. Reverse polarity, input over voltage and output over current, and double battery connection protection is required.
Line and Load regulation better than 1% with ripple and noise <150mV pk/pk. Isolation 2000V AC Input to output, Input to safety Earth > 1500V AC and Output to safety earth > 1500V AC.
Indications and alarms. Mains ON, Float, Boost, Battery Reverse. PFC relay NO/NC/ Com for Charger ON/Fail
We see the unit comprising a SMPS input stage and a SMPS output stage. This is to reduce the weight, dimension and heatsink requirements to a minimum for minimal transport costs. Passive cooling is essential. Connection will be by two screw terminal blocks AC / DC and be a partially protected open frame as it will be a DIN rail mountable unit.
The charger is likely to be manufactured in New Zealand for export to India and must be very competitively priced to achieve market penetration. We expect the total BOM material costs to be sub $12 USD.
Waiting eagerly for you your replies as we need the information as soon as possible to start working on the proposal.
Thanks a lot in advance.
Regards
Saqib Bajwa
